Author/Authors :
Riad، Safaa M. نويسنده Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, 11562- Cairo, Egypt Riad, Safaa M. , Rezk، Mamdouh R. نويسنده Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Egypt , , khattab، Fatma I نويسنده Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., 11562 Cairo, Egypt khattab, Fatma I , Abd El-Rahman، Mohamed K نويسنده Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., 11562 Cairo, Egypt Abd El-Rahman, Mohamed K , Marzouk، Hoda M نويسنده Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., 11562 Cairo, Egypt Marzouk, Hoda M
Abstract :
Selective poly (vinylchloride) membrane electrodes based on a quaternary
ammonium compound, malachite green as a novel ion exchanger for anionic species were
prepared. The developed membrane electrodes were used successfully for the quantification
of sulphadimethoxine, iodide ions and thiocyante ions in their pure powdered forms, fish
water and/or pharmaceutical formulation. Linear responses were obtained within a
concentration range of 10-5-10-2 M for the three selected monovalent anionic species. The
electrodes exhibited unusual half Nernstian slopes when the divalent cationic malachite green
is used as a novel lipophilic ion exchanger in PVC based membranes for determination of
monovalent anions. They have fast response times about 20 s, satisfactory reproducibility,
and long life times
